1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
// SPDX-FileCopyrightText: Bradley M. Bell <bradbell@seanet.com>
// SPDX-FileContributor: 2023-23 Bradley M. Bell
# include <cppad/local/val_graph/tape.hpp>
/*
{xrst_begin val_summation_xam.cpp dev}
Combining Value Operators Into a Cumulative Summation Example
#############################################################
{xrst_literal
// BEGIN_C++
// END_C++
}
{xrst_end val_summation_xam.cpp}
*/
// BEGIN_C++
bool summation_xam(void)
{ bool ok = true;
//
// tape_t, Vector, addr_t,
// add_op_enum, sub_op_enum, mul_op_enum, neg_op_enum
using CppAD::local::val_graph::tape_t;
using CppAD::local::val_graph::Vector;
using CppAD::local::val_graph::addr_t;
using CppAD::local::val_graph::op_enum_t;
op_enum_t add_op_enum = CppAD::local::val_graph::add_op_enum;
op_enum_t sub_op_enum = CppAD::local::val_graph::sub_op_enum;
op_enum_t mul_op_enum = CppAD::local::val_graph::mul_op_enum;
op_enum_t neg_op_enum = CppAD::local::val_graph::neg_op_enum;
//
// tape, ok
tape_t<double> tape;
addr_t n_ind = 4;
addr_t index_of_nan = tape.set_ind(n_ind);
ok &= index_of_nan == n_ind;
Vector<addr_t> op_arg(2);
//
// op_arg, add = x[0] + x[1]
op_arg[0] = 0; // x[0]
op_arg[1] = 1; // x[1]
addr_t add = tape.record_op(add_op_enum, op_arg);
//
// op_arg, mul = x[2] * x[3]
op_arg[0] = 2; // x[2]
op_arg[1] = 3; // x[3]
addr_t mul = tape.record_op(mul_op_enum, op_arg);
//
// op_arg, sub = x[0] + x[1] - x[2] * x[3]
op_arg[0] = add;
op_arg[1] = mul;
addr_t sub = tape.record_op(sub_op_enum, op_arg);
//
// op_arg, neg = x[2] * x[3] - x[0] - x[1]
op_arg.resize(1);
op_arg[0] = sub;
addr_t neg = tape.record_op(neg_op_enum, op_arg);
//
// dep_vec, tape
Vector<addr_t> dep_vec(1);
dep_vec[0] = neg; // x[2] * x[3] - x[0] - x[1]
//
// set_dep
tape.set_dep( dep_vec );
//
// x
Vector<double> x(n_ind);
for(addr_t i = 0; i < n_ind; ++i)
x[i] = double(2 + i);
//
// trace
bool trace = false;
//
// val_vec
Vector<double> val_vec( tape.n_val() );
for(addr_t i = 0; i < n_ind; ++i)
val_vec[i] = x[i];
tape.eval(trace, val_vec);
//
// ok
ok &= tape.n_op() == 5;
ok &= tape.con_vec().size() == 1;
ok &= tape.arg_vec().size() == 2 + 3 * 2;
ok &= tape.n_val() == n_ind + 1 + 4;
//
// summation
tape.summation();
tape.dead_code();
//
// ok
ok &= tape.n_op() == 3;
ok &= tape.con_vec().size() == 1;
ok &= tape.arg_vec().size() == 1 + 2 + 6;
ok &= tape.n_val() == n_ind + 3;
//
// eval
val_vec.resize( tape.n_val() );
tape.eval(trace, val_vec);
//
// y
Vector<double> y(1);
dep_vec = tape.dep_vec();
y[0] = val_vec[ dep_vec[0] ];
//
// ok
ok &= y[0] == x[2] * x[3] - x[0] - x[1];
//
return ok;
}
// END_C++
|
